WinRar doesn't lock you out
after you have tried the wrong password a few times. This tries tons of
passwords in no time until it figures it out. It has three different
approaches you can use. I don't understand them all but the above
describes it best.

RAR Password Recovery is a powerful tool to recover lost (forgotten) passwords for a RAR/WinRar archives. The program supports the Brute-Force attack, dictionary-based attack and dramatically fastest "Booost-Up" attack. The program is able to resume the previous interrupted attack.

Here is a brief list of RAR Password Recovery advantages:

1. Recovers passwords for a RAR/WinRAR archives using combination of Brute-Force, Booost-Up or Dictionary attacks.
2. Very high speed of work (more than 3000 passwords per second in Brute-Force mode and up to 22000 passwords per second in Booost-Up mode).
3. Customizability.
3. Advanced heuristic processor.
4. User-friendly interface.
5. Large wordlist dictionary.
6. Ability to work in the background.
7. Autosave feature.